Velocity of an object as the rate of distance change between the object and a point
"Radial speed" redirects here. Not to be confused with radial motion.
A plane flying past a radar station: the plane's velocity vector (red) is the sum of the radial velocity (green) and the tangential velocity (blue).
The radial velocity or line-of-sight velocity of a target with respect to an observer is the rate of change of the vector displacement between the two points. It is formulated as the vector projection of the target-observer relative velocity onto the relative direction or line-of-sight (LOS) connecting the two points.
The radial speed or range rate is the temporal rate of the distance or range between the two points. It is a signed scalar quantity, formulated as the scalar projection of the relative velocity vector onto the LOS direction. Equivalently, radial speed equals the norm of the radial velocity, modulo the sign.[a]
In astronomy, the point is usually taken to be the observer on Earth, so the radial velocity then denotes the speed with which the object moves away from the Earth (or approaches it, for a negative radial velocity).
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The radialvelocity or line-of-sight velocity of a target with respect to an observer is the rate of change of the vector displacement between the two...
the radial-velocity method, or colloquially, the wobble method) is an indirect method for finding extrasolar planets and brown dwarfs from radial-velocity...
transverse velocity v R {\displaystyle {\boldsymbol {v}}_{R}} is the radialvelocity. The radial speed (or magnitude of the radialvelocity) is the dot...
from Earth, i.e. the variations are in the radialvelocity of the star with respect to Earth. The radialvelocity can be deduced from the displacement in...
the cross-radialvelocity as: ω = d ϕ d t = v ⊥ r . {\displaystyle \omega ={\frac {d\phi }{dt}}={\frac {v_{\perp }}{r}}.} Here the cross-radial speed v...
(19000+6200 −2500 light-years) from comparison with the cluster's radialvelocity, considerably closer than the original distance quoted by Stephenson...
indicates that a radialvelocity analysis might detect a hypothetical planet of 1.8 ME in Alpha Centauri B's habitable zone. Radialvelocity measurements...
The High Accuracy RadialVelocity Planet Searcher (HARPS) is a high-precision echelle planet-finding spectrograph installed in 2002 on the ESO's 3.6m...
is a widely cited statistic for extrasolar planets detected by the radialvelocity method or Doppler spectroscopy, and is determined using the binary...
better calculations of their distance and tangential velocity. When combined with radialvelocity measurements from spectroscopy, astrophysicists were...
Spring 2014. The Multi-object APO RadialVelocity Exoplanet Large-area Survey (MARVELS) monitored the radialvelocities of 11,000 bright stars, with the...
star is circumpolar as the whole continent is above 64° S latitude. Radialvelocity variations were observed in the spectrum of Antares in the early 20th...
milliarcseconds per year. Knowledge of the proper motion, distance, and radialvelocity allows calculations of an object's motion from the Solar System's frame...
8±4 days, consistent with a measurement of 92.1+4.2 −3.5 days from radialvelocity observations. Because of its low mass, the interior of the star is...
proximity of Luhman 16. The radialvelocity of component A is 23.1 ± 1.1 km/s (14.35 ± 0.68 mi/s), and the radialvelocity of component B is 19.5 ± 1.2 km/s...
companion. In 1993, radialvelocity measurements of Aldebaran, Arcturus and Pollux showed that Arcturus exhibited a long-period radialvelocity oscillation,...
component of stellar motion toward or away from the Sun, known as radialvelocity, can be measured from the spectrum shift caused by the Doppler effect...
supercluster. By measuring the radialvelocities of the group's members through astronomical spectroscopy, the velocity dispersion of that group can be...
companion white dwarf star. Precise radialvelocity measurements have shown variations in the stellar radialvelocities and spectral line profiles. The oscillations...
position angle and radialvelocity. These can be combined through vector addition to state the object's motion relative to the Sun. Velocities for local objects...
way. In 1993 radialvelocity measurements of Aldebaran, Arcturus and Pollux showed that Aldebaran exhibited a long-period radialvelocity oscillation,...
showed the three members of the Polaris ternary system. The variable radialvelocity of Polaris A was reported by W. W. Campbell in 1899, which suggested...
following is a list of 456 extrasolar planets that were only detected by radialvelocity method –– 31 confirmed and 323 candidates, sorted by orbital periods...
orbital period of the binary system, and the peak radialvelocity of the observed star. The velocity of one binary component and the orbital period provide...
cause of the radialvelocity variations remained inconclusive. Further studies in 2023: 23–24, 44 and 2024 concluded that the radialvelocity signal very...
Doppler shift” and allows one to assess the radialvelocity of a surface current. That is; the scatter velocity along the line between the hit surface and...
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